4
GMC-I Messtechnik GmbH
8
Initial Start-Up
The
PROFITEST PV
SUN
is supplied with power from four AA batteries
(1.5 V IEC LR6). The batteries must be inserted before the instru-
ment can be used.
➭
Remove the battery compartment lid on the back of the in-
strument by loosening the two Phillips head screws.
➭
Insert the batteries. Be sure to observe the polarity symbols
which are embossed into the floor of the battery compart-
ment.
➭
Replace the battery compartment lid and retighten the
screws.
Attention!
!
The test instrument may only be operated with installed
battery compartment lid.
9
Measurements
Warning!
The photovoltaic system’s plug connectors may not be
disconnected under load. Please observe warnings and
instructions provided by the plug manufacturer.
Caution! Dangerous Voltage
Solar modules continuously generate current, even when
shaded. Regulations for working with live voltage must
be adhered to during all work.
Switching the PROFITEST PV
SUN
On
➭
The test instrument is switched on by pressing the
key.
➭
After the test instrument has been switched on, background
illumination can be switched on by briefly pressing the same
key once again.
➭
Briefly pressing the key a third time switches background illu-
mination back off.
➭
The test instrument can be switched off by pressing and hold-
ing the key for longer than 2 seconds.
9.1
Testing Protective Conductor Continuity
per EN 62446 (VDE 0126-23) (> 200 mA)
If a protective conductor or an equipotential bonding conductor is
included at the DC side of the photovoltaic system, its electrical
connection must be tested for continuity.
The connection to the main grounding terminal must also be tested.
Warning!
Disconnect all solar modules from the system before
performing the measurement.
Compensation for Measurement Cable Resistance
Ohmic measurement cable resistance can be subtracted from the
measurement results automatically. Proceed as follows in order to
determine the resistance offset value:
➭
Switch the
PROFITEST PV
SUN
test instrument on.
➭
Connect the measurement cables to the (–) and (
) sockets
and short-circuit the plug-on test probes.
➭
Press and hold the
COMP
key for at least 2 seconds in order to
trigger offset resistance measurement.
Symbol
briefly appears.
The following display appears after completion of the mea-
surement:
R
LOW
: 0.0
.
The measured
R
OFFSET
value is not displayed, but is permanently stored
internally and is subtracted from the actual result of all subsequent
R
LOW
measurements, until a new offset resistance value is acquired.
If the measured value of the connected cable is > 5
the symbol
briefly appears. Compensation of measurement cable resis-
tance is not possible.
Protective Conductor Resistance Measurement
➭
Connect the (–) socket to a protective conductor terminal at
the solar module and the (
) socket to the equipotential bond-
ing busbar.
➭
Briefly press the
R
LOW
key.
Measurement is started. The
R
LOW
resistance value measured for
the protective conductor system appears at the display:
Example
Attention!
!
Measurement results may be distorted due parallel con-
nected impedances at load current circuits, as well as
equalizing current.
9.2
Polarity Test / Measuring Open Circuit Voltage U
0
per EN 62446 (VDE 0126-23)
Warning!
Disconnect the solar module under test from the system
before performing measurement.
➭
Connect the
PROFITEST PV
SUN
test instrument to the module
with the help of suitable solar plugs.
0
0
U0: 0 V
R
LOW
: 0.1
R
ISO
: ---
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